[Require labeling] any food that has been genetically engineered or contains genetically engineered ingredients.

Defines "genetically engineered" (GE) as a material intended for human consumption that is an organism produced through the intentional use of genetic engineering, or its progeny, without regard to whether the altered molecular or cellular characteristics of the organism are detectable.

Discussion of pro/con (Huffington Post 4/25/2013):

Polls show that the overwhelming majority of Americans--over 90%--supports mandatory labeling of foods with GE ingredients. 64 other countries already require such labels. However, strong opposition from the agriculture and biotech industries has scuttled proposals for GMO (Genetically-Modified Organisms) labeling laws in the past. The most recent and high-profile of these failed attempts at a GMO labeling requirement was California's Proposition 37, which was narrowly
defeated after opponents spent $50 million lobbying against it. "Unfortunately, advocates of mandatory GMO labeling are working an agenda to vilify biotechnology and scare consumers away from safe and healthful food products," a Biotechnology Industry Organization spokeswoman wrote.

Argument in opposition (Food Democracy Now 5/26/2012):

Exactly 20 years ago today, the first Bush administration declared genetically engineered foods to be "substantially equivalent" to foods that farmers had traditionally bred for thousands of years. With this single policy, the US government radically altered the food supply, introducing novel genes into our food that had never before been consumed by humans. Corporate executives at Monsanto colluded with elected officials to make sure that their new "products" were placed onto the market as quickly as possible. Two decades later, Americans are still denied the basic right to know what's in their food because of this infamous policy.